Puncture proof lining for pneumati



H. PB|TCHETT. PUNCTURE PROOF LININD FOR PNEUMATIC TIRES.

mine-Anon FILED 1,34%.

Patented May 6,1919;

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V w. n. PRITCHETT. J PUNCTURE PROOF LIn IING FOR PNEUMATIC TIRES. Arrucmonrluo ocT f-a. ms.

1,302,970. Patented May 6,1919.

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Specificatipn of Letters Patent.

Patented May 6,1919.

Application filed October 3, 191B. semi-1m 956,696".

To all whomdt'may concern:

. Beit known that I, WILLIAM Pnrrcnnrr, Major,U. S. (3., a citizen: of the United States, stationed at Santiago, in the DominicanrRepublieyhave invented certain-new and useful Improvementsiin: Puncture-Proof Li nings for Pneumatic Tires; and I do hereby declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilled; in the art to' which it ippertains to make and use" the same.

y present invention rel-ates to improve ments in puncture proof pneumatic tires, and it is intended to provide a. resilient tire in which the outer casing or shoe may be made either of standard type, or of'thinner material if desired, and the usual inner tube may be used and this tube may be protected againstperforation by a removable armored:

lining which constitutes the essence of my present invention.

This armored lining comprises a metal framework, consisting of a pair of split stay.

rings to which:- BJ'SBIIBS? of overlapping. thin metalstripsor'ribbons are attached, between which metal ribbons one or more layers of canvas, or other suitable: flexible or textile material, may beialaced, and the whole metal frame is engage in a suitable covering of canvas, or other suitable flexible material, the edges of which flexible covering; project inward overtlie outer surface of the rim, and thus a suitable bearing. surface for the inner tube, which prevents the inner tube from being. forced under the edges "of the stay rings, when expanded, is provided M inventionfwill boinore' fully understood.- aiftenreference to the accompanying drawings, in which similar parts are indicated: by simiiarre ferencs symbols throng-h of one of the split rings used 1n 1; .e con struction of the armored lining.

Fig. 4 shows on a smaller scale one of the metal plates or ribbons used in forming the loops, the plate being shown in: the flat po-' sition before being bent up to the shape shown in Figs. 1 and 2.

Fig 5 is a erspeetive view of the completed armored lining in the contracted position, ready for insertion into the outer casing; and

Fig. 6 shows the armored lining in the expanded position, but with the tire casing omitted, and parts being broken away.

A represents the metal rim of the wheel, which rim is shown only in Fig. 1. Any suitable type of demountable rim may be adopted in connection with my invention.

B shows the outer casing or shoe of the tire, and C represents the armored lining which is composed of the inner lining or cover 1 of canvas, projecting inwardly to ward the middle of the rim, as at 1 and inside of which, near its ends, are the split stay rings 2, perforated as at 2*, and preferably' countersunk tomeeeive the heads of the rivets- 3'.- These stay rings are split diagonal ly, as at 2 so that they may eiqp'and when' thetire is infiated-,-and' thus enable the arbored lining to-conform: to the inner shape.

of the inflated tire; and therefore the armored lining will not interfere with or detract from the resiliency orpneumatic qualities of the tire. The split also enables the armored lining to be contracted as shown in Fig. 5,-and thus enables its insertion into the outer casing B, Fig. 1.

Secured to the stay rings 2 are the metal strips; on ribbons 4e and 4*. ofthe general con-- struction shown in Fig. 4;. in which each strip isperforated', as at P,- to engage the rivets 3', (see Figs. 1, and 6') and tapers from the center 4 toward the ends, so that the overlappingportions-maybe or tiailythe same width as shown in Fig. 2.

These metal strips overlap, as shown in Fig. 2, and are preferably bent into the shape shown in Fig. 1 before being attached to the stay rings 2.

Between these strips 4: and 4 I preferably provide one or more layers of canvas, or other suitable textile material, so as to prevent the parts from rubbing on each other, and this textile material is preferably treated, before being inserted, with soap-stone, gra hits, or other suitable lubricant.

xterior to the outer strips 4 is the covering 5, of canvas or other suitable textile material, the inner ed es of which project inward toward the mlddle of the rim, as

shown at 5 in Fig. 1. The outer portion-and inner portion of this canvas covering are sewed togetherat the edges of the stay rings after being placed in position on the armored lining.

When completed, the canvas covering of the armored lining should be treated both outside and inside with graphite, soapstone, or other suitable lubricant, before being sewed on to the armored lining, so as to lessen the friction between the parts. This is more especially important on the inside whenthe inner tube is inserted and inflated, and the tire is in use on the road.

The overlapping metal strips i and 4 may be made of steel or other resilient material, and preferably thick enough only to prevent the penetration into the chamber inside of the armored lining, of a nail, tack, particles of glass, or other objects, which cause punctures to pneumatic tires.

Moreover, this armored lining will protect the tire against blow-outs, as the outer casing may be worn or cut through for several inches and no blow-out will occur, the pressure of the air in the inner tube being taken by the armored lining at the worn or cut place.

The purpose of the textile fabric used in the armored lining between the two layers of metal ribbons is to protect the metal ribbons from rubbing against each other. The purpose of the canvas covering is to protect the inner tube and the outer casing from being rubbed by the metal strips or ribbons, as each ribbon will successively have a slight motion when it reaches the point of contact with the ground when the tire is in use. The purpose of the extension of the edges over the surface of the rim, as at 1 and 5 Fig. 1, is to protect the inner tube from be ing cut by being forced under the stay rings, as these stay rings are slightly distended away from the rim of the wheel, as happens when the tire is inflated.

VVhen'the armored lining is inserted in the outer casing of the tire, the inner tube may be inserted, and the tire complete may be mounted upon the rim and the inner tube inflated in the usual way.

By having the metal framework of the armored linin constructed as shown, the necessary resiliency to the tire as a whole is maintained, and yet the inner tube is eifetually protected against puncture from without.

While I have shown the invention in the preferred form as now understood by me, it will be obvious that various modifications might be made in the combination and arrangement of parts which could be used without departing from the spirit of my invention, and I do not intend to limit the invention to such details of construction except as particularly pointed out in the claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent of the United States is 1. In an armored pneumatic tire, the combination with the outer casing, of a removable armored lining for said casing comprising a pair of split stay rings, a series of overlapping thin strips of resilient metal bent in the form of loops to fit the interior of said casing, said strips having their opposite ends secured respectively to said split stay rings, and a sheathing of textile fabric inclosing said loops and said rings, substantially as described.

2. In an armored pneumatic tire, the combination with the outer casing, ofa remov- I able armored lining for said casing comprising a pair of split stay rings, a series of overlapping thin strips of resilient metal bent-in the form of loops to fit the interior of said casing, said strips having their opposite ends secured respectively to said split stay rings, a layer of textile fabric inter posed between said overlapping loops, and a sheathing of textile fabric inclosing said loops and said rings, substantially as de-' scribed.

. In testimony whereof, I afiix my si nature.

W. H. PRITC ETT.

' Copies of thin patent may be obtained for five cents each, by addressing the "Gonimissioner o1 Patents,

Washington, D. 0. 

